Bit-gage.



W. J. PARSONS.

BIT GAGE. APPL IOATION FILED JAN. 4,1909.

Patented May 25, 1909.

Witnesses:

'UNTTFLT) sra rns PATENT WILLIAM J. PARSONS, OF MONTAGUE, MASSACHUSETTS, ASSIGNOR TO MILLERS FALLS COM- PANY, OF MILLERS FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

BIT-GAGE.

Application filed January 4, 1909.

To all whom it may concern:

Be it known that- 1, WILLIAM J. PARsoNs, of Montague, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Bit- Gages, of which the following is a specification.

This invention relates to a stop or gage adapted to be detachably and adjustably secured to the shank of a bit or auger, and come to a bearing on the surface into which the bit is inserted, and thus limit the depth of the hole made by the bit.

The invention has for its object, first, to provide an improved construction of bit stop including improved means for connecting the rod which supports the foot, with the shank of a bit, and an improved form of anti-frictional foot adapted to bear upon the surface of the body into which the bit has been driven without liability of scarring or defacing said surface.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification,-Figure 1 represents a side elevation of a bit and a stop embodying my invention applied thereto. Fig. 2 represents a section on line 2 2 of Fig. 1, and a plan view of the parts below said line. Fig. 3 represents a section on line 33 of Fig. 1. Fig. 4 represents a side view of one of the plates hereinafter referred to. Fig. 5 represents a perspective view of the bolt forming a part of the clamp, hereinafter referred to. line 66 of Fig. 1.

The same reference characters indicate the same parts in all the figures.

In the drawings, 12 represents the shank of a boring bit of ordinary construction.

13 represents a gage rod provided at one end with a foot 14 adapted to bear on a body into which the bit has been driven, and limit the depth of the hole formed by the bit, suitable means being provided, as hereinafter described, for detachably and adjustably securing the rod 13 to the bit shank. The said attaching means comprise two opposed metal plates 15 and 16, and a clamp adapted to force said plates toward each other, said clamp comprising a screwthreaded bolt 17 having a head 18 bearing upon one of the plates, and a thumb nut 19 Specification of Letters Patent.

Fig. 6 represents a section on I Patented May 25, 1909.

Serial No. 470,723.

bearing upon the opposite plate. The plates are provided at one end with a set of preferably flat aws 20 and 21 adapted to grasp the bit shank 12, and at the opposite end with a set of tubular jaws 22 and 23, which are preferably three in number, two of the tubular jaws being formed on the plate 16 and separated by a space which receives the other tubular aw, which is formed on the plate 15. The tubular jaws 22 and 23 are formed to embrace and turn upon the gage rod 13.

The bolt 17 passes through orifices formed for its reception in the plates 15 and 16 between the two sets of jaws, the arrangement being such that when the nut 19 is adjusted inwardly, the aws 20 and 21 are pressed i11- wardly against the bit shank, and the jaws 22 and 23 are at the same time pressed inwardly against the rod, the jaw 22 being pressed in the direction indicated by the arrow at, Fig. 3, while the aws 23 are pressed inwardly in the direction indicated by the arrow y in Fig. 2. The pressure thus simultaneously imparted to the two sets of jaws causes one set of jaws to firmly grasp the bit shank and the other set of jaws to firmly grasp the gage rod, the engagement being sufficiently firm to prevent accidental slippage of either set of jaws on the part grasped thereby. When the nut 19 is adjusted outwardly, the two sets of jaws simultaneously release their hold on the bit shank and gage rod, thus allowing the device as a whole to be removed from the bit shank, and allowing the gage rod to be adjusted endwise in the tubular jaws.

The bolt 17 is prevented. from rotating with the nut by the engagement of flattened sides 24 on the bolt head with the edges of a slot 25 formed in the plate 16.

26 represents a spring which surrounds thebolt 17 between the plates and acts to press the plates apart when the nut is adjusted outwardly. The plates are provided with bosses 27 surrounding the orifice through which the bolt passes, the inner sides of said bosses forming recessed seats for the ends of the spring 26.

The foot 14 is preferably spherical, and is rotatively engaged with the gage rod, the latter being enlarged. at its lower end and having a cavity 28 which receives a portion of the spherical foot 1 1. The bottom of the cavity is concave and forms a seat 29 for a group of antifriction balls which are interposed between said seat and the spherical foot 14. The mouth of the cavity 28 is slightly contracted at 31 below the center of the spherical foot to retain the foot in place in the cavity.

It will be seen that the foot is adapted to rotate freely in any direction, and that it presents a convex surface to the body on which it bears, the foot being adapted to roll on said body without marring the same.

I claim:

1. A bit gage comprising a gage rod having at one end a foot adapted to bear on a body into which a bit has been inserted, opposed substantially parallel plates having a set of bit-shank-engaging jaws at one end, and a set of substantially tubular rod-engaging jaws at the opposite end, one plate having two rodengaging jaws with a space between them and the other plate having a rod-engaging jaw occupying said space, and means engaging said plates to press them together between the two sets of jaws, and adapted to simultaneously engage one set with the bit shank and the other set with the rod.

2. A bit gage comprising a gage rod having at one end a foot ada ted to bear on a body into which a bit has een inserted, a pair of opposed substantially parallel plates having a set of jaws at one end adapted to grasp the shank of a bit, and a set of substantially tubular jaws at the other end, one plate having two rod-engaging jaws with a space between them and the other plate having a rod-engaging jaw occupying said space, a bolt passing through the clamping plates between the jaws and sockets, and having a head bearing on one of said plates, and a nut engaging the bolt and bearing on the other plate.

3. A bit gage comprising a gage rod having at one end a foot ada ted to bear on a body into which a bit has b een inserted, a pair of opposed substantially parallel plates having a set of aws at one end adapted to grasp the shank of a bit, and a set of substantially tubular jaws at the other end, one plate having two rod-engaging jaws with a space between them, and the other plate having a rod-engaging jaw occupying said space, a bolt passing through the clamping p ates between the jaws and sockets, and having a head bearing on one of said plates, and a nut engaging the bolt and bearing on the other late, whereby one set of jaws may be engage with the bit shank simultaneously with the engagement of the other set with the gage rod, and a spring surrounding the bolt between the plates and adapted to press the latter apart.

In testimony whereof I have aflixed my signature, in presence of two witnesses.

WILLIAM J. PARSONS. Witnesses:

KATHERINE E. NIoHoLs, EARLE A. BROWN. 

